Steam-generator



J. J VBURWELL. STEAM GENBRATUR.

Patented Dee. 23, 1890.

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(No Model.)

WITNESSES //MM v WZ MMM UNITED STATES PATENT OFFICE.

JOHN J. BURVELL, OF COVINGTON, KENTUCKY.

STEAM-GENERATOR.

SPECIFICATION forming part 0f Letters Patent No. 443,354, dated December23, 1890.

Application filed April 8, 1890. Serial No. 347,065. (No model.)

To all whom it may concern:

Be it known that I, JOHN J. BURWELL, of Covington, in the county ofKenton and State of Kentucky, have invented anew and useful Improvementin Steam-Generators, which improvement is fully set forth in thefollowing specilication and accompanying drawings, in whichi Figure I isa vertical longitudinal section of a locomotive-boiler provided with myimproved device; Fig. 2, a vertical cross-section of the same on line 0cin Fig. 1, and Fig. 3 a vertical cross-section on line y y in Fig. 1.

My invention relates to improvements in steam-generators of the classgenerally used in connection with locomotive-engines. My object is toprovide a simple and practical device, whereby a more thoroughcombustion of the fuel is secured, the lues and their connectionsrendered more durable, alarger heating-surface obtained withoutincreasing the size or number of the flues, a decreased gratesurface,and a consequent saving of fuel and labor, together with immunity fromdestructive fires caused by sparks from the smokestack.

My invention consists in dividing the lines into three groups orsections and arranging the groups in a vertical series with intermediateregenerative chambers between the sections, Whereby the gases arereplenished by the admission of a suitable supply of air during theirpassage from one series of liues to another. By this plan the heatnecessarily traverses the body of water thrice instead of only once, asin boilers constructed in the usual manner.

Referring t0 the accompanying drawings, A designates the shell of alocomotiveboiler; B, the fire-box, from which the names pass into theupper group of fines O, and thence into the chamber D, which is providedwith an apertureE for the admission of oxygen, the supply of which isregulated by a suitable valve having a connecting-rod or other appliance(not shown) extending to the cab. The heat, being thus replenished,passes through the middle group of iiues F and into the secondregenerative chamber G, where it receives an additional supply of oxygenthrough thevalve H. The lowest group of Iiues I receives and conveys theproducts of combustion into the smoke-box J, where it meets the exhaustand is discharged through the smoke-stackin the usual manner. Ifpreferred, the lowest group of flues may extend only to the dotted lineK; but if the construction of the boiler should permit, it is desirablethat they be extended forward, as shown in the drawings.

The operation of the device will now be explained. XVhen the flames passthrough the upper group of lues and reach the chamberD, the naturalupward tendency of the heat temporarily retards the current. The surpluscarbon is thus permitted to intermingle with the oxygen admitted by thevalve E. The flame is thus re-enforced and enters the middle group offlues and passes into the second regenerative chamber G,`where there-enforcing process is repeated with an important additional advantage.It is a well-known fact that a large portion of fuel is wasted inboilers having only one set of fines. Unconsumed fragments of coke arecarried through by the force-draft and thrown out of the smokestack.Bridges and other valuable property are thereby ignited and destroyed.In order to obviate such danger and secure complete combustion, thesecond chamber G extends downward below the plane of the lowest group offlues and forms a pocket. The draft being partially checked by theadmission of air, as hereinbefore described, the particles of carbon orcoke fall into the receptacle and are consumed, and the additional heatthus produced is utilized by the adjacent waterspaces M M. The ashes andother residuum may be removed through the trap-door L.

It is furthermore understood that in ordinary boilers, which have nomeans of distributing the heat uniformly, the tubes are liable to buckleand spring leaks, especially when the heat is irst applied. In thisdevice the heating process is necessarily more gradual and uniform, andthe tubes are not subjected to sudden and unequal strains.

l. A steam-generator of the locomotive type having the regenerativechambers D and G, the latter at the rear of the fire-box and its heatutilized by the adjacent waterchambers M M, and both of said chambersprovided with apertures for the admission of IOO nir, in combinationwith horizontal liues arranged in th rec Verticallydisposed grou ps undcommunicating, as described, with said chambers und with the smokesteck,:is and for the purposes seb forth.

2. In combination with the Iirebox B and the regeneraitive-chnmber G :1tthe rem', surrounded, as described, by the water-spaces M M, the groupof pipes C, Rund I, regenerative chem bers D und G, suitable provisionbeing made for the admission of air to the said chambers I) and G,substentin'lly :is set forth.

In a steam-boiler as described, the channbcr Gut the rear of theiire-bCX, having` adjzv cent lthereto the water chambers or spaces ill Mand extending down to form :L pocket, und having therein :L valve bywhich snid pocket can bc cleaned, substzintinllyns set forth.

4. In n steam-boiler, a chamber at the rear of the IireboX, with whichthe tlucs carrying the smoke und other products of combustioncommunicate, extending below the said lues so as to form e pocket forcinders, the., and provided with a valved opening` by which it can becleaned out, uli as und for the purposes Set forth.

In testimony that I claim the foregoing I have hereunto set my hand,this lst luy of April, 1890, in the presence of witnesses.

JOIIN J'. BURWELL.

V"itnesses:

SAMUEL 11` i nSY'rHn, R. MILLAP..

